Zakhary (Kharyton or Kharko) Oleksiyovych Chepiha (Ukrainian: Захарій (Харитон / Харко) Олексійович Чепіга), sometimes transliterated Chepiga, alternative surname: Kulish (Ukrainian: Куліш) (1725 – 14 January 1797) was, after Sydir Bily, the second Kosh ataman of the Black Sea Cossack Host.
In 1783 he made an unsuccessful attempt at organizing a cohort of volunteer cossacks from the Zaporozhia.
After meeting up with Catherine II in 1787, he was one of the cossacks to convince the Empress in allowing the formation of the Host of the Loyal Zaporozhians, later known as the Black Sea Cossack Host.
After Sydor Bily's death, he was proclaimed the Host's ataman.
For his efforts, Chepiha received the rank of the Order of St. George.